Diagnosis Procedure

WARNING: This page is about a different car, the 2011 Infiniti FX50. However, it is still accessible from the selected car via links, so may be relevant.

CHECK VVEL CAN COMMUNICATION CIRCUIT

Turn ignition switch OFF.
Disconnect ECM harness connector.
Disconnect VVEL control module harness connector.

Check the continuity between ECM harness connector and VVEL control module harness connector.

CONTINUITY REFERENCE CHART

ECM		VVEL control module		Continuity
Connector	Terminal	Connector	Terminal	Continuity
F111	89	E16	24	Existed
F111	93	E16	11	Existed

Also check harness for short to ground and short to power.
Is the inspection result normal?

YES: GO TO 3.

NO: GO TO 2.

DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E10, F10
- Harness for open or short between ECM and VVEL control module
  Repair open circuit, short to ground or short to power in harness or connectors.
CHECK INTERMITTENT INCIDENT
Refer to "INTERMITTENT INCIDENT ".

Is the inspection result normal?

YES: GO TO 4.

NO: Repair or replace.
REPLACE VVEL CONTROL MODULE
1. Replace VVEL control module.
2. Perform "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT (VVEL CONTROL MODULE) : SPECIAL REPAIR REQUIREMENT ".
  GO TO 5.
PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-III
1. Reconnect all harness connectors disconnected.
2. Turn ignition switch ON.
3. Select "SELF DIAGNOSTIC RESULT" mode with CONSULT-III.
4. Touch "ERASE".
5. Perform DTC Confirmation Procedure.
  See "DTC LOGIC ".
With GST
1. Reconnect all harness connectors disconnected.
2. Turn ignition switch ON.
3. Select Service $04 with GST.
4. Perform DTC Confirmation Procedure.
  See "DTC LOGIC ".
  
  Is the DTC U1024 displayed again?
  
  YES: GO TO 6.
  
  NO: INSPECTION END
REPLACE ECM
1. Replace ECM.
2. Go to "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT (ECM) : SPECIAL REPAIR REQUIREMENT ".
  INSPECTION END